<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>权限列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <!-- 添加角色按钮区 -->
        <el-col>
          <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
        </el-col>

        <el-col>
          <!-- 角色列表区域 -->
          <el-table :data="rolesList" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">

                <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' :  '' , 'vcenter' ]" 
                v-for="(item1, i1) in scope.row.children" :key="item1.id">
                  <!-- 渲染一级权限 -->
                  <el-col :span="5">
                    <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>

                  <!-- 渲染二和三级权限 -->
                  <el-col :span="19">
                    <!-- 通过 for 嵌套 渲染二级权限 -->
                    <el-row :class="[i2 === 0 ? '' : 'bdtop' , 'vcenter' ]" 
                     v-for="(item2, i2) in item1.children" :key="item2.id" >
                     
                      <el-col :span="6">
                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">
                          {{ item2.authName }}
                        </el-tag>
                        <i class="el-icon-caret-right"></i>
                      </el-col>

                       <!-- 通过 for 嵌套 渲染三级权限 -->
                        <el-col :span="18">
                          <el-tag type="warning" 
                           v-for="(item3 ) in item2.children" :key="item3.id" 
                           closable @close="removeRightById(scope.row, item3.id)">
                            {{ item3.authName }}
                          </el-tag>
                        </el-col>

                    </el-row>
                  </el-col>

                </el-row>

              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column prop="roleName" label="角色名称"></el-table-column>
            <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
            <el-table-column label="操作" width="300px">
              <template v-slot="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" 
                 @click="showEditDialog(scope.row.id)">编辑
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" 
                 @click="removeRoleById(scope.row.id)" >删除
                </el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting"
                 @click="showSetRightDialog(scope.row)" >分配权限
                </el-button>

              </template>
            </el-table-column>
          </el-table>
        </el-col>

      </el-row>
    </el-card>

    <!-- 添加角色对话框 -->
    <el-dialog title="添加角色" :visible.sync="addDialogVisible" @close="addDialogClosed">
    <!-- 内容主体区域 -->
      <el-form :model="addRolesForm" :rules="addFormRules" ref="addFormRef" label-width="90px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addRolesForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addRolesForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRolesUser">确 定</el-button>
      </span>

    </el-dialog>

    <!-- 编辑对话框 -->
    <el-dialog title="修改角色" :visible.sync="editDialogVisible" width="40%">
      <!-- 内容主体区域 -->
      <el-form :model="editRolesForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editRolesForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editRolesForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

     <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="SetRightDialogVisible" width="50%" 
    @close="setRightVisibleClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" 
      :default-expand-all="true"  :default-checked-keys="defKeys"  ref="treeRef">
      </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="SetRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色的列表
      rolesList: [],
      // 添加角色对话框的显示和隐藏
      addDialogVisible: false,
      // 编辑对话框的显示和隐藏
      editDialogVisible: false,
      // 控制分配权限对话框的显示和隐藏
      SetRightDialogVisible: false,

      //添加角色表单数据(收集你在弹框填写的数据)
      addRolesForm: {
        roleName: '',
        roleDesc: ''
      },

      // 添加表单的验证规则对象
      addFormRules: {
        roleName: [
          { required: true,  message: '请输入角色名',  trigger: 'blur' },
          { min: 2, max: 10, message: '角色名长度在 2 ~ 10 个字符', trigger: 'blur'},
        ], 
        roleDesc: [
          { required: true, message: '请输入角色描述', trigger: 'blur' },
          { min: 2, max: 20, message: '输入的范围是 2 ~ 20 为字符', triggetr: 'blur' }
        ]
        
      },

      //编辑角色表单数据(收集你在弹框修改的数据)
      editRolesForm: {},

      // 编辑表单的验证规则对象
      editFormRules: {
        roleName: [
          { required: true, message: '请输入角色名字', trigger: 'blur' },
          {  min: 2,  max: 10,  message: '输入的范围是 2 ~ 10 为字符',  triggetr: 'blur' }
        ],
        roleDesc: [
          { required: true, message: '请输入角色描述', trigger: 'blur' },
          { min: 2, max: 20, message: '输入的范围是 2 ~ 20 为字符', triggetr: 'blur'  }
        ]
      },

       // 所有权限的数据
      rightsList: [],

      // 树形控件的绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 树形控件 -> 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的角色的ID
      roleId: ''
    }

  },

   created() {
    this.getRolesList()
  },

  methods: { 
    // 获取角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败!')
      }
      this.rolesList = res.data
      // console.log(this.rolesList);
      // console.log(this.rolesList.id, 'getRoles')
    },

     // 添加角色
    addRolesUser() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('roles', this.addRolesForm)
        // console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败!')
        }
        this.$message.success('添加角色成功!')
        this.getRolesList()
        this.addDialogVisible = false
      })
      // console.log(this.addRolesForm)
    },

     // 清空添加角色对话框
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },

    // 点击编辑按钮 弹框得到修改用户的信息
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色失败!')
      }
      //每点击一次按钮 就每次向服务器获取数据 并赋值给这个对象(会覆盖)
      this.editRolesForm = res.data
      // console.log(this.editRolesForm)
      this.editDialogVisible = true
    },

    //点击确定修改角色信息并提交
    editRoleInfo() {
      this.$refs.editFormRef.validate(valid => {
        if (!valid) return
        // 发起修改角色信息的数据请求
        this.$http.put('roles/' + this.editRolesForm.roleId, {
            roleName: this.editRolesForm.roleName,
            roleDesc: this.editRolesForm.roleDesc
          }).then(res => {
              if (res.data.meta.status !== 200) {
                 return this.$message.error('修改角色失败!')
              }
              // 提示修改成功
              this.$message.success('修改角色成功!')
              // 刷新数据列表
              this.getRolesList()
              })
              // 关闭对话框
              this.editDialogVisible = false
      })
    },

    // 删除角色
    async removeRoleById(id) {
      const confirmRusult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '删除角色', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // console.log(confirmRusult)
      // 用户点击了删除,则返回字符串 confirm
      // 用户取消了删除,则返回字符串 cancel

      if (confirmRusult !== 'confirm') {
        return this.$message.info('已取消该删除操作')
      }
      
      // 没有使用await
      this.$http.delete('roles/' + id).then(value => {
        const { data: res } = value
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('该用户删除失败')
        }
        this.$message.success('该用户已经删除')
        this.getRolesList()
      })

    },

     // 根据ID删除对应的权限
     async removeRightById(role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
        // console.log(confirmResult)
        // 用户点击了删除,则返回字符串 confirm
        // 用户取消了删除,则返回字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除!')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败!')
      }
      // 直接调用获取用户的方法会导致展开栏的关闭,这样体验不好
      // this.getRolesList()
      // 可以直接把返回的最新数据直接赋值
      role.children = res.data
      // console.log('删除')
    },

     // 展示分配权限的对话框
    async showSetRightDialog(role) {
      //点击按钮时就拿到角色的ID
      this.roleId = role.id

      // 获取所有权限列表
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限列表失败!')
      }
      // 获取到的权限数据保存
      this.rightsList = res.data
      // console.log(this.rightsList)

      // 递归获取三级节点
      this.getLeafKeys(role, this.defKeys)
      //点击按钮显示对话框
      this.SetRightDialogVisible = true
    },

      // 通过递归的形式,获取角色下所有的三级权限的id,并保存到 defKeys数组中
      getLeafKeys(node, arr) {
        // 如果当前node节点没有children属性 则是三级节点
        if (!node.children) {
           return arr.push(node.id)
        }
        node.children.forEach(item => 
        this.getLeafKeys(item, arr)) //依次往里层查找(用递归)
      },

       // 监听分配权限对话框的关闭事件
      setRightVisibleClosed() {
        // 清空 defkeys 数组  避免累积
        this.defKeys = []
      },

       // 点击为角色分配权限
       async allotRights() {
         // 拿到你勾选权限节点的ID, 然后放入到一个数组
         const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
         // 把它们形成 以逗号分割的 字符串
         const idStr = keys.join(',')

         const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
         if (res.meta.status !== 200) {
           return this.$message.error('分配权限失败!')
         }
         this.$message.success('分配权限成功!')
         this.getRolesList()
         this.SetRightDialogVisible = false
       }

  },

}
</script>

<style lang="less" scoped>

  .el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
   display: flex;
   align-items: center;
}

</style>